I don't remember anything about it in the rules, but I would agree with CJbennett22 that stands shouldn't split from their unit to take the shortest route (as Lex does with the left most stand). The rules may allow it, but I view that as an oversight and wouldn't do it.
The difference with my way then is:
1) Move the rightmost stand 4cm right. It will become the leftmost stand later, which will take 12cm of move. That gives it 4cm to move forward.
2) The centre stand moves 8 right, 4 forward and 8 left.
3) The left stand moves 12 right, 4 forward and 4 left.
The end result is that the units are exactly aligned, but with a 2cm gap (vs Lex's 4cm).